d andeee



(No Model.) 2 Sh'eetsSheet l.

L. DANDREE.

ROTARY STEAM ENGINE.

No.-29 2,898. Patented Feb. 5,1884."

WITNESSES V l/VI/ENTOI? 13% m {hfqrneys N. PETERS. PhowLilho n hur.wahin lun. D. C.

30 piece or block, F,so that a perfect joint is i 40 the channel E intothe cylinder, the entrance UNITED STATES PATENT OFFICE.

LOUIS DANDREE, OF RIGA, RUSSIA, ASSIGNOR TO HIMSELF AND LUHYVIG LOEWE 8:00., OF BERLIN, GERMANY.

ROTARY STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 292,899, dated February5, 1824.

Application filed June 22, 1883. (No model.)

To aZZ whom it may concern:

Be it known that I, LOUIS DANDREE, engineer, residing at Riga-,- in theEmpire of Bussia, have invented certain new and useful Improvements inRotary Steam-Engines, of which the following is a specification.

This invention relates to rotary steamengines; and it consists in theconstruction and combination of parts, which will be hereinafter morefully described, and then set forth in the claim.

In the drawings, Figure l is a transverse section of a rotary engineconstructed according to my invention. Fig. 2 is a front view [5thereof. Fig. 3 is a longitudinal section, and

Fig. 4 is a top view.

The steam or working cylinder A is mounted on a suitable base plate orframe, and contains an eccentric piston, B, which is keyed 011 a shaft,0, having its hearings in the end heads of the cylinder and in supportsbeyond the latter. The piston is formed with a radial slot, D, (shown inFigs. 1 and 3,) which opens in the steam-outlet port or channel E.(Shown in dotted lines in Fig.1.) The steam-cylinder is provided with asteam-outlet pipe, G, and at the top it has a cut-off slide or abutment,F, which is formed with a convex face inserted into a concave seat inthe bottom of a carrierinsured between the piston' and abutment in allthe positions the former may assume. The carrier-piece F is packedsteam-tight in a chamber in the top of the cylinder, and is 3 5 pressedin a downward direction by means of two spiral springs, f. The steamfrom the boiler passes through the pipe P and port H in thecylinder-head into the radial slot D of the piston, and from thence itissues through of the steam taking place as soon as the mouth E of thechannel E has, by reason of the rotation of the piston, passed in rearof the cut-off slide. The entrance of the steam into the cylindercontinues until the radial slot D has 5 passed the inlet opening or portH in the cylinder-head, when the steam acts expansively for turning thepiston. The amount of steam admitted into the cylinder as theworkingforce is determined by the length of the radial slot D, as isreadily apparent.

G is a pipe and port for the escape of the exhaust steam.

I have in the present instance shown only one piston, but I mayconstruct a twin engine with two pistons, arranged at an angle of onehundred and eighty degrees in relation to each other.

I am aware of the existence of a rotary steam-engine having a pistonorwheel which 6c is placed eccentrically within a casing, and has slotsfor the reception of sliding valves or abutments' that are forcedagainst the casing by the action of the steam.

Having thus described myinventiomwhat I claim as new, and desire tosecure by Letters Patent, is-

In a rotary steamengine, the combination of the eccentric-piston B,having the radial slot D, leading from the side face of the piston, andthe channel E, extending from said slot to the periphery of the piston,with the cylinder A, the cut-off slide F, fitted in the latter, thesteam-inlet port H, and steam-outlet port G, all constructed andrelatively arranged as 7 5 herein set forth, for the'purpose specified.

- In testimonywhereof I have signed my name to this specification in thepresence of two subscribing witnesses.

L. DANDREE. \Vitnesses:

PETER lvl. SEINBUL, TH. HARPLE.

